JP2009290662A - Image transmitting apparatus and image receiving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reproduce original input image data in a deterioration reduced state at a receiving side by transmitting image data in a deterioration reduced state even if transmission capacity of a data communication line is limited. <P>SOLUTION: In an image transmitting apparatus 10, an encoder 12 selects and encodes a part of a plurality of color components constituting image data captured by an image capturing section 11 as a color component to be encoded and cyclically switches the selected color component. A data transfer section 13 transfers encoded data of the selected color component to a network 30. In an image receiving apparatus 20, a data receiver 21 receives the encoded data of the selected color component via the network 30, a decoder 22 decodes the received encoded data of the selected color component, and an accumulator 23 accumulates the decoded data of the selected color component. A combiner 24 combines the image data of decoded the selected color component and image data of decoded selected color component already accumulated in the accumulator while differing a color component, thereby reproducing an image. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image transmission apparatus and an image reception apparatus in a system that transmits and receives moving images between devices connected to a data communication line with a limited transmission capacity such as a network.

Conventionally, when transmitting image data via a network with a limited bandwidth, by setting the resolution of the attention area of the image high, while encoding the image data by setting the resolution of the other area low, A system that secures desired image quality while reducing the amount of information is disclosed (see, for example, Patent Document 1).
JP-A-7-288806 (page 5-10, FIG. 1-10)

  In recent years, the number of pixels of an image sensor has increased, and as a result, the amount of image data has been increasing. Under such circumstances, there is a need for a technique for transmitting a moving image over a network with minimal image quality degradation in an apparatus that transmits image data over a network, such as a network camera. In the system of Patent Document 1, when the resolution of the attention area is set high, the resolution of other areas is set extremely low, and when the image is reproduced by the receiving device, the image quality is so severe that the contents cannot be discriminated. May contain.

An image transmission apparatus according to the present invention includes:
An image acquisition unit for acquiring input image data from the outside;
A part of a plurality of color components constituting the color information of the image data acquired by the image acquisition unit is selected as a limited encoding target color component each time, and the image data of the selected color component is selected in a predetermined method And an encoding unit that cyclically replaces the selected color component;
A data transfer unit that transfers the image data of the selected color component encoded by the encoding unit to a data communication line.

An image receiving apparatus according to the present invention is
A data receiving unit that receives image data of a selected color component that is cyclically replaced and encoded via a data communication line;
A decoding unit for decoding the image data of the selected color component received by the data receiving unit;
An accumulation unit for accumulating image data of the selected color component decoded by the decoding unit;
The selected color component image data decoded by the decoding unit is combined with the decoded selected color component image data already stored in the storage unit in a different color component state. And a composition unit for reproducing an image.

  In the image transmission apparatus having the above configuration, the encoding unit selects a part of the plurality of color components in the input image data as limited color components to be encoded each time, and the image data of the selected color component is predetermined. After being encoded by the above method, the data is transferred to the data transfer unit. The data transfer unit transfers the encoded image data of the selected color component to the image receiving device via the data communication line. The encoding unit repeats encoding while cyclically replacing the selected color component. In this method, the encoding target by the encoding unit and the data transfer target by the data transfer unit are limited to some color components of the input image data in the image acquisition unit. Therefore, the amount of information of image data to be processed is reduced, the coding rate is suppressed, and as a result, even when the transmission capacity of the data communication line is limited, the image data can be transmitted with little deterioration. It becomes possible.

  Further, in the image receiving apparatus having the above configuration, the synthesizing unit decodes the image data of the currently selected color component decoded by the decoding unit and the decoding already stored in the storage unit in a state where the color component is different. The generated image data of the past selected color component is synthesized to reproduce the image. Due to the function of the combining unit attached to the storage unit, the image data sent via the data communication line is limited to a part selected from a plurality of color components in the input image data ( The original input image data can be reproduced with no deterioration even if the selected color component image data).

  In the image transmission apparatus having the above-described configuration, the encoding unit selects the selected color component in the image data acquired by the image acquisition unit for each frame such as a Y component, a U component, a Y component, a V component, a Y component, and a U component. There is a mode in which the coding is repeated and replaced.

  Further, in the image transmission device having the above configuration, the encoding unit may repeatedly encode the selected color component in the image data acquired by the image acquisition unit for each frame such as a Y component, a UV component, a Y component, and a UV component. There is a mode of becoming.

  The image transmitting apparatus having the above configuration further includes a division pattern setting unit capable of changing a color component division pattern, and the encoding unit acquires the image in accordance with the color component division pattern set by the division pattern setting unit. The image data of the selected color component is encoded while the selected color component is replaced for each frame, and the divided pattern setting unit adds the encoded color data of the selected color component to the encoded image data of the selected color component. There is a mode in which color component division pattern information is added and transferred from the data transfer unit. When configured in this way, it is possible to adaptively set the color component division pattern in the division pattern setting unit in accordance with changes in the congestion status of the data communication line. In other words, it is possible to transmit image data with little deterioration regardless of changes in the congestion status of the data communication line.

  The image transmission apparatus having the above configuration further includes a motion detection unit that detects a motion amount of an image reproduced from the image data acquired by the image acquisition unit, and the encoding unit detects the motion detection unit. When the amount of motion of the image becomes larger than a predetermined threshold, there is a mode in which the image data of all the color components of the image data is encoded instead of selecting the color component of the image data. When the motion of the image is fast, even if the image quality is deteriorated due to the low resolution, there is not much visual problem. Therefore, when the amount of motion of the image is larger than the predetermined threshold, the selection of the color component is stopped, and switching to the encoding of the image data of all the color components is performed. As a result, it is possible to increase the speed of image processing.

  The image transmission apparatus having the above configuration further includes a motion detection unit that detects a motion amount of an image reproduced from the image data acquired by the image acquisition unit, and the encoding unit receives the image data of the selected color component. The encoded data and the motion amount information of the color component different from the color component encoded by the motion detection unit are transferred by the data transfer unit, and the color component to be encoded is replaced for each frame. There are aspects. By selecting, from the data transfer unit, information on the amount of motion of a color component different from the color component that has been encoded together with the encoded data of the selected color component, past selection is performed according to the amount of motion of the image on the image receiving device side. It is possible to perform motion compensation of image data of color components.

And about the image receiving device,
A data reception unit that receives the amount of motion of a color component different from the data obtained by encoding the image data of the selected color component and the encoded color component;
A decoding unit for decoding the image data of the selected color component received by the data receiving unit;
An accumulation unit for accumulating image data of the selected color component decoded by the decoding unit;
A motion compensation unit that performs a motion compensation process on the past image data stored in the storage unit using a motion amount of the transmitted image;
A smoothing unit that smoothes past image data stored in the storage unit and decoded data by the decoding unit with a predetermined algorithm according to a motion amount of the image;
There is an image receiving apparatus configured to include a synthesis unit that synthesizes the decoded data of the currently selected color component smoothed by the smoothing unit and the data after motion compensation of the selected color component to reproduce an image. .

  Since there is a temporal difference between the image data of the current selected color component and the image data of the past selected color component, there is a possibility that color shift may occur during composition for a moving subject. The motion compensation unit and the smoothing unit alleviate this color shift.

  According to the present invention, when an image signal is transmitted through a data communication line such as a network, the image data to be encoded and transmitted is limited to a part of color components. The amount of information to be encoded can be reduced to suppress the encoding rate, and an image with little image degradation can be transmitted.

  Embodiments of the present invention will be described below with reference to the drawings. Note that each of the embodiments described below is merely an example, and various modifications can be made.

(Embodiment 1)
FIG. 1 is a block diagram showing an overall configuration of an image communication apparatus A1 according to Embodiment 1 of the present invention.

  This embodiment is a system for transmitting an image having an enormous amount of data via a data communication line having a limited transmission capacity such as a network. The present invention can be applied not only to a network but also to various data communication lines that connect an image transmission device and an image reception device.

  A feature of this embodiment is that only a part of color components of image data (image data of selected color components) is transmitted within one frame, and the image data of the currently selected color component received on the receiving side and past selections are received. This is to synthesize image data of color components. As a result, the amount of image information can be reduced and the coding rate of the image can be suppressed, and an image with little deterioration can be transmitted even during image communication with a limited transmission capacity.

  As shown in FIG. 1, the image communication apparatus A1 according to the present embodiment includes an image transmission apparatus 10, an image reception apparatus 20, and a network 30 that performs data transmission between the image transmission apparatus 10 and the image reception apparatus 20. It consists of two parts. In addition, an imaging device 40 is connected to the image transmission device 10, and a display device 50 is connected to the image reception device 20. Not only the imaging device 40 but also a device that outputs image data can be connected to the image transmission device 10.

  The image transmission device 10 includes an image acquisition unit 11, an encoding unit 12, and a data transfer unit 13.

  The image acquisition unit 11 performs processing for taking image data input from the imaging device 40 into a memory. The input image data can be in YUV format or RGB format. YUV is a luminance / color difference multiplexed signal, Y is a luminance signal, U is a red color difference signal, and V is a blue color difference signal.

  The encoding unit 12 reads the image data from the memory of the image acquisition unit 11 and limits some of the plurality of color components constituting the color information of the image data according to a color component division pattern preset in a storage unit such as a ROM. Is selected each time as a color component to be encoded, and the image data of the selected color component is encoded with a known image compression algorithm such as predictive encoding, orthogonal transform encoding, vector quantization, etc. The converted data is output to the data transfer unit 13.

  The data transfer unit 13 transmits the encoded color component image data to the network 30.

  In the above configuration, the color components to be encoded are sequentially replaced according to the color component division pattern and are updated cyclically.

  The image receiving device 20 includes a data receiving unit 21, a decoding unit 22, a storage unit 23, and a combining unit 24.

  The data receiving unit 21 receives the encoded data of the selected color component received from the network 30 and outputs it to the decoding unit 22. The decoding unit 22 decodes the encoded data of the selected color component and outputs it to the storage unit 23. The synthesizing unit 24 makes the color component different from the image data of the currently selected color component decoded by the decoding unit 22 and stored in the storage unit 23 according to the color component division pattern information set in advance. The image data of the past decoded color components that have already been stored in (1) is read out and combined to restore the image.

  For example, when the input image data is in the YUV format, a case where the color component is divided into a Y component, a U component, and a V component and transmitted in the order of YUVYUV will be described with reference to FIG.

Now, it is assumed that the image acquisition unit 11 of the image transmission apparatus 10 has acquired image data of the nth frame. The encoding unit 12 encodes the Y component Y _n of the input image data of the nth frame and outputs it to the data transfer unit 13. The data transfer unit 13 transmits the encoded data to the network 30. The decoding unit 22 of the image receiving apparatus 20 that has received the encoded data of the Y component Y _n of the input image data of the nth frame decodes the image data and stores it in the storage unit 23. In the synthesis unit 24, the Y component Y _n of the nth frame image data received in the current frame stored in the storage unit 23 and the V component of the (n−1) th frame image data received one frame before. V _n−1 and the U component U _n−2 of the image data of the (n−2) th frame received two frames before are combined to reproduce the reproduced image P _n of the nth frame. Next, in the (n + 1) th frame, the V component V _n−1 of the (n−1) th frame image data, the Y component Y _n of the nth frame image data, and the (n + 1) th frame image data. The U component U _{n + 1} is synthesized to reproduce the reproduced image P _{n + 1} of the (n + 1) th frame, and the same processing is repeated while changing the color component to be sequentially updated.

  Further, as shown in FIGS. 3 and 4, the color components of the image data may be divided and transmitted.

In the example of FIG. 3, the image data is divided into a Y component, a U component, and a V component, and is transmitted while being exchanged as Y · U · Y · V · Y · U · Y · V. In this case, the U component _Un-2 of the input image data is transmitted in the (n-2) frame, and the encoded data of the Y component Y _n-1 of the input image data is transmitted in the (n-1) frame. and has, n-th frame of the reproduced image and the U component U _n-2 of the input image data that has been accumulated (n-2) th frame to the V component V _n and the storage unit 23 of the input image received in the current frame The reproduced image P _n is obtained by synthesizing the decoded data of the Y component Y _n−1 of the input image data of the (n−1) th frame. (N + 1) in the th frame Y component Y _{n + 1} of the encoded data of the input image data is updated, the combining unit 24 and the Y component Y _{n + 1} of the (n + 1) input image data th frame, n th frame The V component V _n of the input image and the U component U _n-2 of the input image data of the (n-2) th frame are synthesized to reproduce the image.

In the example of FIG. 4, the image data is divided into a Y component and a UV component and transmitted alternately. In this case, the image transmission device 10 transfers the encoded data of the UV component UV _n of the input image data to the network 30 at the nth frame, and the image reception device 20 is stored in the storage unit 23 (n−1). The Y component Y _n-1 of the image data received in the frame and the UV component UV _n of the image data received in the current frame are combined to reproduce the image. The Y component Y _{n + 1} of the input image data is transmitted to the (n + 1) th frame, and the composition unit 24 of the image receiving device 20 receives the UV component UV _n of the _nth frame image data and the image data received in the current frame. The Y component Y _{n + 1} is synthesized to reproduce the image. Thereafter, the update of the Y component and the UV component is repeated alternately in the same manner.

  The present invention is not limited to the example described above, and various color component dividing methods and combinations such as transmitting YU components and YV components of image data every other frame are conceivable. The YUV format signal is not limited to YUV444, and the amount of information can be further reduced by using a format such as YUV422, YUV420, or YUV411. An RGB format image can be input to the image acquisition unit 11, and the image acquisition unit 11 has a function of converting the YUV format to the RGB format. As shown in FIG. 5, the R component, the G component, and the B component It is also possible to divide and transmit.

  The combining unit 24 reproduces the image data and outputs the reproduced image data to the display device 50.

  As described above, according to the present embodiment, the encoding unit 12 converts a part of the plurality of color components (image data of the selected color component) in the input image data for the image data to be encoded within one frame. Since the image data of the selected color component is encoded and transferred from the data transfer unit 13 to the image receiving device 20, the information amount of the image data to be processed is reduced and the coding rate is increased. As a result, even when the transmission capacity of the network 30 is limited, the image data can be transmitted with little deterioration. Further, since the image receiving device 20 is configured to synthesize the received image data of the currently selected color component and the image data of the past selected color component, the original input image data is reproduced without deterioration. can do.

(Embodiment 2)
FIG. 6 is a block diagram showing the overall configuration of the image communication apparatus A2 according to Embodiment 2 of the present invention. In FIG. 6, the same reference numerals as those in FIG. 1 of the first embodiment indicate the same components, and detailed description thereof will be omitted. In the present embodiment, a division pattern setting unit 14 is added to the image transmission apparatus 10. The division pattern setting unit 14 has changeable storage means such as a register, and sets the data format and color component division pattern of the input image in the storage means. Here, the color component division pattern is information indicating whether transmission / reception of image data is performed using, for example, the color component division pattern as shown in FIG. 2 or the color component division pattern as shown in FIG.

  In accordance with the setting of the division pattern setting unit 14, the encoding unit 12 sets a part of a plurality of color components constituting the color information for the image data read from the image acquisition unit 11 as limited color components to be encoded each time. The image data of the selected color component is encoded. The data transfer unit 13 adds the color component division pattern information to the encoded image data and transmits it to the network 30.

  The synthesizing unit 24 in the image receiving device 20 includes the image data of the currently selected color component decoded by the decoding unit 22 and stored in the storage unit 23 according to the color component division pattern information sent together with the image data, The image data of the past decoded color components that have already been stored in the state where the components are different from each other is read and combined to restore the image.

  Since the state of transmission and reproduction of image data is the same as in the first embodiment, description thereof is omitted.

  As described above, according to the present embodiment, the division pattern setting unit 14 can set the color component division pattern in accordance with the change in the congestion status of the network 30, and therefore the change in the congestion status of the network 30 can be set. Regardless of this, the image data can be transmitted with little deterioration.

  Note that the data transfer unit 13 may be configured to have the traffic measurement function of the network 30 so that the color component division pattern is automatically changed according to the load status. In this configuration, when the load on the network 30 is light, all the color components of the image data are transmitted within one frame, and when the network 30 is congested, some color components are selected, and the selected color components Send only image data. As a result, the capacity of the image data can be increased or decreased according to the congestion status of the network 30.

(Embodiment 3)
FIG. 7 is a block diagram showing the overall configuration of the image communication apparatus A3 according to Embodiment 3 of the present invention. In FIG. 7, the same reference numerals as those in FIG. 1 of the first embodiment indicate the same components, and detailed description thereof will be omitted. In the present embodiment, a motion detection unit 15 is added to the image transmission device 10. The memory in the image acquisition unit 11 stores the input image data of the previous frame, and the motion detection unit 15 calculates the motion amount of the image from the difference between the input image data of the current frame and the input image data of the previous frame. To detect. A threshold value for switching the color component division pattern of the image data is set and stored in the storage unit of the motion detection unit 15. In the encoding unit 12, a color component division pattern is set and stored in advance in storage means such as a ROM.

  When the motion amount of the image detected by the motion detection unit 15 is equal to or smaller than the color component division pattern switching threshold, the encoding unit 12 follows the preset color component division pattern as in the first embodiment. When a part of the plurality of color components of the image data is selected and the image data of the selected color component is encoded. On the other hand, when the amount of motion of the detected image is larger than the color component division pattern switching threshold, The image data of all the color components are encoded in one frame without dividing the color components of the image data. The data transfer unit 13 adds the color component division pattern information to the encoded image data and transmits it to the network 30.

  When the encoded data received from the network 30 is divided into color components, the synthesizing unit 24 in the image reception device 20 sets a color component division pattern set in advance as in the first embodiment. According to the information, the image data of the currently selected color component decoded by the decoding unit 22 and stored in the storage unit 23, and the past decoded color components already stored in a state where the color components are different. The image data is read out and combined to restore the image. On the other hand, when the encoded data received from the network 30 includes not all color components but all color components, the decoded image data from the decoding unit 22 is output to the display device 50 as it is. .

  Note that the image transmission device 10 has the same division pattern setting unit as that of the second embodiment, sets two color component division patterns, and switches between the two color component division patterns according to the color component division pattern switching threshold. It may be.

  As described above, according to the present embodiment, the motion detection unit 15 detects the speed of image motion, and when the amount of image motion is greater than a predetermined threshold, the selection of color components is stopped and all colors are selected. Switch to component image data encoding. This is based on the fact that when the movement of the image is fast, even if the image quality is deteriorated due to the low resolution, there is not much visual problem. As a result, the image processing speed can be increased.

(Embodiment 4)
FIG. 8 is a block diagram showing the overall configuration of the image communication apparatus A4 according to Embodiment 4 of the present invention. In FIG. 8, since the same reference numerals as those in FIG. 7 of the third embodiment indicate the same components, detailed description thereof will be omitted.

  In the case of Embodiment 3, the synthesizing unit 24 performs image data of the currently selected color component decoded by the decoding unit 22 and stored in the storage unit 23 in accordance with color component division pattern information set in advance. Then, the image data of the past decoded color components that have already been stored in a state where the color components are different are read out and combined to restore the image. At this time, there is a temporal difference between the image data of the selected color component in the current frame and the image data of the selected color component in the past frame, so that there is a possibility that a color shift occurs at the time of composition in a moving subject. In the present embodiment, this color shift is alleviated.

  In the present embodiment, a motion compensation unit 25 and a smoothing unit 26 are added to the image reception device 20.

  The motion compensation unit 25 performs motion compensation processing on the past frame image data stored in the storage unit 23 using the prediction error and the motion vector transmitted together with the image data, and the motion compensated The image data is output to the smoothing unit 26. Here, the prediction error and the motion vector transmitted together with the image data will be described. These are calculated by the motion detection unit 15 in the image transmission apparatus 10 and transmitted from the data transfer unit 13 to the network 30. .

  The smoothing unit 26 is configured to perform a process of blurring the image data according to the amount of motion of the image sent together with the image data, using a smoothing filter such as a moving average method.

  The motion detection unit 15 of the image transmission apparatus 10 detects a motion vector from the input image and the image data of the previous frame, creates a predicted image from the image data of the previous frame and the motion vector, and transmits the current frame. A prediction error, which is a difference between a predicted image having no color component and an input image, and a motion vector are added to the image data together with the amount of motion and transmitted. A motion vector is a block that most closely resembles a prediction target image in a prediction image when a block most similar to a block to be encoded is detected from the prediction image by dividing the input image into m × n blocks. It is a vector which shows. FIG. 9 shows a schematic diagram of a prediction error and a motion vector.

  When transmitting the encoded image data to the network 30, the data transfer unit 13 adds the prediction error calculated by the motion detection unit 15, the motion vector, and the amount of motion of the image.

  For example, the case where image data is divided into Y component, U component, and V component and transmitted as shown in FIG. 2 will be described.

When sending Y component Y _n of the image data of the n th frame, V components of the image data of the n th frame V _n and (n-1) were prepared from the V component V _n-1 of the image data of the frame th The prediction error and motion vector, and the U component U _n of the nth frame image data and the (n−1) th frame U component predicted image U _n−1 ′ ((n−1) frame image data sending by adding the prediction error and the motion vector created from the U component U _n-1 and (n-2) of the image data of th frame predicted image produced from the U component U _n-2).

In the image receiving apparatus 20 that has received these image data, the motion compensation unit 25 includes the V component V _n−1 and (n−2) of the (n−1) th frame image data stored in the storage unit 23. A motion compensation process is performed on the U component _Un-2 of the image data of the frame using the prediction error and the motion vector transmitted together with the image data.

In the smoothing unit 26, the V component V _n-1 of the image data of the (n-1) th frame after the motion compensation, the U component U _n-2 of the image data of the (n-2) frame, and the current frame. The Y component Y _n of the nth frame of image data is smoothed according to the amount of motion received together with the image data. The synthesizing unit 24 then performs the Y component Y _n of the nth frame image data after motion compensation and smoothing, the V component V _{n−1 of} the (n−1) th frame image data, and the (n−2) th frame. The U component U _n-2 of the image data is synthesized to reproduce the image.

  The visual acuity of the human eye is reduced for moving subjects. Therefore, if the image data of the selected color component of the past frame and the current frame is blurred and then synthesized by the synthesis unit 24, it is possible to alleviate the color shift due to the temporal difference of each selected color component.

  The motion detection unit 15 divides the input image data into m × n blocks, detects the motion amount for each block, adds it to the image data, and transmits it. The smoothing unit 26 transmits the motion amount for each m × n block. If smoothing is performed according to the above, a more natural image can be reproduced. However, since the amount of information increases as the block size decreases, it is necessary to select an appropriate number of blocks.

  Further, in order to prevent blurring of only a part of the image by performing smoothing according to the amount of motion for each block, the entire image may be smoothed according to the block having the largest amount of motion. Further, when the amount of movement is large, the saturation of the color component may be reduced to make the color shift inconspicuous.

  Note that the image transmission apparatus 10 may have a division pattern setting unit, perform encoding according to the set color component division pattern, and send the color component division pattern information together with the image data and the motion amount from the data transfer unit 13. .

  The technology of the present invention is an image transmitting apparatus that transmits image data in a state with little deterioration in a system that transmits and receives moving images via a data communication line with a limited transmission capacity such as a network, and the original input image data. It is useful as an image receiving apparatus that reproduces the image without deterioration.

1 is a block diagram showing an overall configuration of an image communication apparatus according to Embodiment 1 of the present invention. The figure showing a mode that image data is divided into a Y component, a U component, and a V component in Embodiment 1, and transmission and reception are performed in the order of Y, U, and V The figure showing a mode that image data is divided into a Y component, a U component, and a V component in Embodiment 1, and transmission and reception are performed in the order of Y, U, Y, and V The figure showing a mode that image data is divided into a Y component and a UV component in Embodiment 1, and transmission and reception are performed in the order of Y and UV. The figure showing a mode that image data is divided into R component, G component, and B component in Embodiment 1, and is transmitted and received in the order of R, G, and B FIG. 2 is a block diagram showing an overall configuration of an image communication apparatus according to Embodiment 2 of the present invention. FIG. 3 is a block diagram showing an overall configuration of an image communication apparatus according to Embodiment 3 of the present invention. FIG. 9 is a block diagram showing the overall configuration of an image communication apparatus according to Embodiment 4 of the present invention. The figure showing a motion vector and a prediction error in Embodiment 4

Explanation of symbols

A1 to A4 Image communication device 10 Image transmission device 11 Image acquisition unit 12 Encoding unit 13 Data transfer unit 14 Division pattern setting unit 15 Motion detection unit 20 Image reception device 21 Data reception unit 22 Decoding unit 23 Accumulation unit 24 Synthesis unit 25 Motion compensation unit 26 Smoothing unit 30 Network 40 Imaging device 50 Display device

Claims (8)

An image acquisition unit for acquiring input image data from the outside;
A part of a plurality of color components constituting the color information of the image data acquired by the image acquisition unit is selected as a limited encoding target color component each time, and the image data of the selected color component is selected in a predetermined method And an encoding unit that cyclically replaces the selected color component;
An image transmission apparatus comprising: a data transfer unit that transfers image data of a selected color component encoded by the encoding unit to a data communication line. A data receiving unit that receives image data of a selected color component that is cyclically replaced and encoded via a data communication line;
A decoding unit for decoding the image data of the selected color component received by the data receiving unit;
An accumulation unit for accumulating image data of the selected color component decoded by the decoding unit;
The selected color component image data decoded by the decoding unit is combined with the decoded selected color component image data already stored in the storage unit in a different color component state. An image receiving apparatus comprising: a combining unit that reproduces an image.   The encoding unit replaces the selected color component in the image data acquired by the image acquisition unit for each frame, such as a Y component, a U component, a Y component, a V component, a Y component, and a U component, and repeatedly encodes the selected color component. Item 8. The image transmission device according to Item 1.   2. The image according to claim 1, wherein the encoding unit repeatedly encodes the selected color component in the image data acquired by the image acquisition unit by replacing the selected color component for each frame such as a Y component, a UV component, a Y component, and a UV component. Transmitter device. Furthermore, a division pattern setting unit capable of changing the color component division pattern is provided,
The encoding unit selects a color component of the image data acquired by the image acquisition unit according to the color component division pattern set by the division pattern setting unit, and replaces the selected color component for each frame. The image transmission apparatus according to claim 1, wherein image data is encoded, color component division pattern information by the division pattern setting unit is added to the encoded image data of the selected color component, and is transferred from the data transfer unit. And a motion detection unit that detects a motion amount of an image reproduced from the image data acquired by the image acquisition unit,
When the amount of motion of the image detected by the motion detection unit is greater than a predetermined threshold, the encoding unit replaces the selection of the color component of the image data with the image data of all the color components of the image data The image transmitting apparatus according to claim 1, wherein the image is encoded. And a motion detection unit that detects a motion amount of an image reproduced from the image data acquired by the image acquisition unit,
The encoding unit transfers, by the data transfer unit, data obtained by encoding the image data of the selected color component and information on the amount of motion of a color component different from the color component subjected to the encoding by the motion detection unit. The image transmission device according to claim 1, wherein color components to be encoded are replaced for each frame. A data reception unit that receives the amount of motion of a color component different from the data obtained by encoding the image data of the selected color component and the encoded color component;
A decoding unit for decoding the image data of the selected color component received by the data receiving unit;
An accumulation unit for accumulating image data of the selected color component decoded by the decoding unit;
A motion compensation unit that performs a motion compensation process on the past image data stored in the storage unit using a motion amount of the transmitted image;
A smoothing unit that smoothes past image data stored in the storage unit and decoded data by the decoding unit with a predetermined algorithm according to a motion amount of the image;
An image receiving apparatus comprising: a combining unit that combines the decoded data of the current selected color component smoothed by the smoothing unit and the motion-compensated data of the selected color component to reproduce an image.

Images